Question about 2005 Volkswagen Golf

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My dog chewed off the trailer + car wiring plug and sockets. I want to replace them but need wiring diagram for the car's towbar socket & the diagram for trailer plug. Car is 2005 VW polo 1.9 Tdi, trailer is Glider (now bought over by Venter. I believe the wiring is a global standard? I'm in South Africa Thanks

Posted by Anonymous on

  • Anonymous Sep 14, 2009

    Could not find VW Polo Comfortline in your drop down list so used "Golf". They'd be similar
    found pics on other sites on the internet



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Found this on the Wb

My dog chewed off the trailer + car wiring plug - b7204bc.jpg

Posted on Sep 14, 2009


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I am trying to wire a towbar on a 2004 Mercedes E class but I have no car wiring diagram. I need to know the wire colours. HELP!

If you want to wire a towbar, I'd say, you can't wire a towbar, as a towbar is meant to be used to pull trailers, right? But, had you said I am trying to fit and wire a car trailer socket for my 2004 Mercedes E Class so I can plug a trailer plug for the trailer's taillights, etc. I would have understood what your needs are. Now, to fit and wire a socket to your Mercedes you need an testing tool costing less than UD$10.00. This tool it like a small screwdriver with a tip almost like a neddle and is used to punch into live sheaths of wires to see which wire is conducting (has power). This small tool is usually of plastic contruction and has a removable cap at the other end and has a length of wire with a small aligator clip at the other end of the wire. This aligator clip is clamped on a negative ( - ) surface, such as any exposed bolts or metal part of the engine or body of your car. The cap of this tool can also be unscrewed
to replace the small 12V light if it ever blows (fuses out). The overall reason of this tool is to be used to very carefully (and I mean it) pierce into any sheathed wires the check if any current is present when a particular action is being performed. The tool can be purchased at any reputable speed shop. Now, to begin with wire finding and assembly of the socket you need to first locate the braided (wrapped in a plastic tape) cable at the back part of the car, usually as close to the rear body (boot). After finding this cable (it has all the wires that control the tail lights, brake lights and reversing lights wrapped into 1 bundle), you now have to prepare a similar length of braided or prepacked cable that has wires inside expecially designed and coloured for use with most cars. In this care, if your Mercedes has different color wires, do not worry about it because you can mark them with a texta or special sticky take and write on them the different colors so that you wont become confused. Note that most speed shops sell rolls of cable specially for wiring car trailers. Just purchase a short length, depending on your requirements, unless you are to wire the whole trailer, I will discuss the objective of fitting and wiring the car with a trailer socket. Next, you may have to drill a hole where you want the cable to exit near the towbar (closest to the towball) and then you may have to decide where to screw the socket on the car, either on the lower part of its body or on a already welded plate especially fitted for the purpose of fitting a socket. This plate is usually closest to the towball. Now, lets start using the special tool to detect the current and noting down which wire is for brakes, tail light, reverse, etc. Go into the boot and locate the bundled cable. If it has a sheath, carefully cut it open and expose the 5 or 6 wires, depending on what country you are, each is different. Once you cut the sheath about 4 inches or more and have exposed the wires, try and separate them a little apart so you can work on them one by one. Now, here you need a helper to turn the parkers (lights) on, press the brake pedal to activate the brake lights, turn the ignition on but do not start the engine and put the gear selector into reverse (automatic or not), etc. Next, remove 2 or so inches of sheath from the purchased cable, spread the 5 or 6 wires apart and... if you have a wire stripper, so much the better, otherwise use a knife, being carefully not to cut or strip the copper strands in each wire. If you do, you'll have to start again. So be careful. if strands are not broken or snapped, you'll get full power to the trailer lights. If they're stripped or cut, the wires may get hot and probably cook themselves out at the point where the strands are missing. Remember, all strands must be twisted before use. Now put this aside for a moment and, with a helper to give you a hand for a few minutes, you first ask him/her to turn the lights on, then punch each exposed wires from the sheathed cable you found in the boot of your car and, with the poined part of this tool note which one has the current or power flowing that turn the car's tail lights on. Note the colour of this wire. You have a choice that you either strip this cable right away and then connect the twisted exposed copper wire, apply a solder with a soldering iron or make a good twist around the exposed wire in the boot that has the current flowing, mark this as (eg, Orange - tail lights) tail lights and then tape it with black automotive plastic tape, or you have the other choice that you puch all of the wires, locate their currents and which color is which for the following lights. I'd stick with the first option if I was you. So, next, ask your helper to depress the brake pedal and then again punch the sharp tip of the tool into the sheath of any of the other remaining wires (in the car boot that is) untill you locate the wire that has current to the brake lights. Once located (it is usually red colored), carefully strip it about half an inch and then bind the red wire from the purchased cable and either you solder it or you make sure it is a good wrap-around wirework and then wrap around this one as well with automotive insulating tape.
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